SK5301 / SK5302 / SK5305 - User-Programmable USB or PS/2 Multimedia Keyboard Encoders with 8x20 Scan, PWM Backlight, Key Lock, External PS/2 and Secure Upgradable Bootloader
SK5301-LT / SK5302-LT / SK5305-LT
48-pin QFN, 0.4 mm pitch, 6 x 6 x 0.75 mm
SK5301-LP / SK5302-LP / SK5305-LP
48-pin LQFP, 0.5 mm pitch, 7 x 7 x 1.6 mm
Overview
The SK5301, SK5302 and SK5305 are full speed USB 2.0 HID keyboard encoder ASICs with an 8-row by 20-column matrix, one PWM backlight brightness output, a BLEN backlight enable output, and five keyboard lock-status LEDs. They support multimedia, user-defined function, macro, Fn, FnLock, NumLock-impacted, and KeyLock keys.
SK5302 adds a USB and PS/2 keyboard combo interface with host-interface auto-detection; its USBEN pin can also select PS/2-only operation. SK5305 adds a hot-pluggable external PS/2 port for a standard 3-button, wheel or 5-button mouse. SK5301 provides the core USB keyboard interface without these PS/2 options.
The field-upgradable bootloader provides version anti-rollback and LMS post-quantum firmware signature authentication to support EU Cyber Resilience Act requirements. Matrix settings, firmware and model upgrades are managed with Sprintek FlexSuite tools. All three models share the same 48-pin assignment and are available in QFN and LQFP packages.
Features
- Full speed USB 2.0 HID interface
- USB and PS/2 keyboard combo interface with auto-detection (SK5302)
- PS/2 scan sets 1, 2 and 3 with multimedia-key support (SK5302)
- Hot-pluggable external PS/2 port for 3-button, wheel or 5-button mice (SK5305)
- Field-upgradable bootloader with anti-rollback and LMS post-quantum firmware authentication
- EU Cyber Resilience Act ready firmware-update design
- 8 x 20 keyboard scan for up to 160 keys
- 1 PWM backlight brightness output and BLEN backlight enable
- 5 keyboard lock-status LEDs and up to 16 generic LED drive pins
- Fn, FnLock, NumLock-impacted, KeyLock, multimedia, function and macro key support
- Advanced ghost-key detection
- Built-in oscillator; no external crystal required
- 5.9 mA typical operating current; 540 µA typical USB suspend current
- 5 V mode: 4.0 to 5.5 V; 3.3 V mode: 3.0 to 3.6 V
- Industrial temperature range: -40°C to +85°C
- Pb-free and RoHS-compliant QFN48 and LQFP48 packages
Package and Ordering Information
| Part Number | Host Interface | External Port | Package | Body Size (L x W x H) |
|---|---|---|---|---|
| SK5301-LT | USB 2.0 | None | 48-pin QFN, 0.4 mm pitch | 6 x 6 x 0.75 mm |
| SK5301-LP | USB 2.0 | None | 48-pin LQFP, 0.5 mm pitch | 7 x 7 x 1.6 mm |
| SK5302-LT | USB 2.0 / PS/2 | None | 48-pin QFN, 0.4 mm pitch | 6 x 6 x 0.75 mm |
| SK5302-LP | USB 2.0 / PS/2 | None | 48-pin LQFP, 0.5 mm pitch | 7 x 7 x 1.6 mm |
| SK5305-LT | USB 2.0 | PS/2 mouse | 48-pin QFN, 0.4 mm pitch | 6 x 6 x 0.75 mm |
| SK5305-LP | USB 2.0 | PS/2 mouse | 48-pin LQFP, 0.5 mm pitch | 7 x 7 x 1.6 mm |
Order SK5301-LT for SK5302-LT or SK5305-LT, and SK5301-LP for SK5302-LP or SK5305-LP. Upgrade the device to SK5302 or SK5305 during production with the FlexSuite toolset.
Support Software
Download the Sprintek keyboard design tools.
FlexEditor
Edit the keyboard matrix, scan-code mapping, macro keys and feature settings.
FlexSign
Sign released matrix files to protect the approved configuration.
FlexProgrammer
Program matrix settings, securely upgrade firmware and configure SK5301 devices as SK5302 or SK5305.
FlexTester
Verify key events and the completed keyboard design.